Title

HIGH TEMPERATURE/VELOCITY EROSION OF THERMAL BARRIER COATINGS: FIELD DIAGNOSIS AND LABORATORY TESTING APPROACH

Authorship

Augusto César Barrios Tamayo; Luis Emilio Tobón Botero; Pablo Andrés Gómez Florez; Alejandro Toro

Augusto César Barrios Tamayo

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Luis Emilio Tobón Botero

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Pablo Andrés Gómez Florez

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Alejandro Toro

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DOI

10.5151/1472-5836-25466

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Abstract

The high temperature erosion of Thermal Barrier Coatings (TBCs) is one of the main factors that define the lifespan in gas turbine components as it is considered the second source of failure of hot path components in power and propulsion turbine operation. The worn Top Coat (TC) surface in components such as first stage turbine blades affects the turbine efficiency due to energy losses and the increment in heat transfer to substrate. The first part of this work consists in describing a HTE test facility developed to emulate the damage conditions found in a number of components of gas turbines; in this testing machine, the samples were exposed to combustion gases moving at velocities close to 1.5 Mach and temperatures of 1100°C. The second part consists in the characterization of liners and first stage turbine blades of a GE7FA gas turbine used for power generation. The last part deal whit correlation of the features of TC’s worn surfaces with the erosion conditions and the dominant degradation mechanisms between test samples and turbine components were compared.

Keywords

TBC; High temperature erosion; Turbine blade; Erosion testing facility; Turbine inspection; TMF; CTE